Hey everyone,

I have a 2010 r56 mini hatchback non turbo

I have been having a misfire / terrible idle on the engine for a while.
Codes are cylinder 1 misfire and multiple cylinder misfire.

I have changed the plugs, swapped coils, swapped injector. Did a compression test and all are at 194psi. Did a leak down test and found a leaking valve. Removed the head and sent it to get repaired.

I now have the engine all back together and started it up, ran fine for the first 10 minutes and then boom bad idle. Took it for a calm drive and it drives great but when stopping it misfires and has a rough idle like it wants to stall. No misfire while driving. Scan tool data shows misfire on cylinder one during idle.

I’m grasping at straws here on what it could be.

I have looked into the valvetronic system and when looking at data. During idle my actual is 51 and set point is 6552. With research I have done this doesn’t seem right.

Wondering if anyone can help me out with this or if they have seen this before.

Thanks

Mike